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It's obvious for someone who knows what's the halting problem and its theoretical importance. Is it obvious for the average guy who wants to learn Perl ? There are still people who try to patent perpetual movement devices.

The only complaint I've gotten about that exercise from anybody who has actually read the book is from a person who has an agenda about me personally, or people easily influenced by her.

If that's a reference to the people who I think it's a reference to, then it's worth pointing out that those people have put a lot of work into getting CPAN working as well as it does. Any objection they have to your exercise is probably driven by a desire to keep CPAN useful far more than by any personal feelings they m